Editing Passiflora (section)

===Ornamental===
[[File:Flickr - ggallice - Passiflora, Gainesville.jpg|thumb|''[[Passiflora incarnata]]'', one of the most common passion flowers]]

A number of species of ''Passiflora'' are cultivated outside their natural range for both their flowers and fruit. Hundreds of hybrids have been named; hybridizing is currently being done extensively for flowers, foliage and fruit. The following hybrids and cultivars have gained the [[Royal Horticultural Society]]'s [[Award of Garden Merit]]:
*'Amethyst'<ref>{{cite web|url=https://www.rhs.org.uk/Plants/56115/Passiflora-Amethyst/Details |title=RHS Plant Selector Passiflora 'Amethyst' AGM / RHS Gardening |publisher=Apps.rhs.org.uk |access-date=2021-01-25}}</ref>
*[[Passiflora × exoniensis|''P.'' × ''exoniensis'']]<ref>{{cite web|url=https://www.rhs.org.uk/Plants/76115/Passiflora-x-exoniensis/Details |title=RHS Plant Selector Passiflora × exoniensis AGM / RHS Gardening |publisher=Apps.rhs.org.uk |access-date=2021-01-25}}</ref> (Exeter passion flower)
*[[Passiflora × violacea|''P.'' × ''violacea'']]<ref>{{cite web|url=https://www.rhs.org.uk/Plants/60660/Passiflora-x-violacea/Details |title=RHS Plant Selector Passiflora × violacea AGM / RHS Gardening |publisher=Apps.rhs.org.uk |access-date=2021-01-25}}</ref>

During the [[Victorian era]] the flower (which in all but a few species lasts only one day) was very popular, and many hybrids were created using the [[winged-stem passion flower]] (''P.&nbsp;alata''), the [[blue passion flower]] (''P.&nbsp;caerulea'') and other tropical species.

Many cool-growing ''Passiflora'' from the Andes Mountains can be grown successfully for their beautiful flowers and fruit in cooler Mediterranean climates, such as the [[Monterey Bay]] and [[San Francisco]] in [[California]] and along the western coast of the U.S. into [[Canada]]. One blue passion flower or hybrid even grew to large size at [[Malmö Central Station]] in [[Sweden]].<ref>Petersen (1966)</ref>

Passion flowers have been a subject of studies investigating [[extranuclear inheritance]]; [[paternal]] inheritance of [[chloroplast]] DNA has been documented in this genus.<ref>E.g. Hansen ''et al.'' (2006)</ref> The [[plastome]] of the [[two-flowered passion flower]] (''P.&nbsp;biflora'') has been [[DNA sequencing|sequenced]].